President Volodymyr Zelenskiy said on Thursday that large-scale Russian attacks overnight in various parts of Ukraine showed Moscow was avoiding negotiations about ending the more than three-year-old war.

Ukrainian officials have reported that Russia launched a massive overnight aerial attack that included a missile strike that hit an American business.

NATO allies and Ukraine are working together to make sure security guarantees for Ukraine are at such a robust level that Russia will never try to attack again, NATO chief Mark Rutte said on Friday, adding that Europe and the United States would be involved in providing them.

NATO defense chiefs have discussed potential security guarantees for Ukraine to help end Russia’s three-year war

Top U.S. and European defense officials spent much of this week privately discussing possible military options in Ukraine that would bolster the Eastern European country’s protections against Russia as part of a broader peace agreement.